package com.sky.aspect;

import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 公共字段自动填充切面类
 */

@Slf4j
@Component
@Aspect
public class AutoFillAspect {
    @Before("@annotation(com.sky.anno.AutoFill)")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段数据填充");
        //1.获取当前被拦截的方法参数,并拿到注解里属性值
        MethodSignature MethodSignature = (MethodSignature) joinPoint.getSignature();//方法签名
        Method method = MethodSignature.getMethod();//方法对象
        AutoFill autoFill = method.getAnnotation(AutoFill.class);
        OperationType value = autoFill.value();

        //2.获取到目标方法的参数对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object entity = args[0];//拿到的就是实体对象

        //3.判断注解中的属性，为INSERT，就填充四个字段（创建时间，创建人，更新时间，更新人）
        try {
            if (value == OperationType.INSERT) {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                setCreateTime.invoke(entity, LocalDateTime.now());
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                setCreateUser.invoke(entity, BaseContext.getCurrentId());
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                setUpdateTime.invoke(entity, LocalDateTime.now());
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateUser.invoke(entity, BaseContext.getCurrentId());

            } else if (value == OperationType.UPDATE) {
                //4.判断注解中的属性，为UPDATE，就填充两个字段（更新时间，更新人）
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                setUpdateTime.invoke(entity, LocalDateTime.now());
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                setUpdateUser.invoke(entity, BaseContext.getCurrentId());
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }


    }
}
